Thanks for your review, Dmitry.
I have replaced verify() with compare_digest().
Python requires a C89 compatible compiler and 32bit architecture. C89 doesn't mandate 64bit integers. As far as I remember there is (or was) one buildbot with a compiler, that doesn't have 64 ints on an old SPARC system. All major platforms have 64bit ints. I might modify the implementation when the patch has landed.
#self.assertIn(h.name, self.supported_hash_names)
I now check for guaranteed and eventually supported hashes.
SSE is enabled on X64_86. I forgot to remove the comments.
The test suite is missing tests for salt, personal and tree hashing. I have asked Zooko and JPA for vectors.